<?php
/**
 * CMssqlColumnSchema class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @author Christophe Boulain <Christophe.Boulain@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CMssqlColumnSchema class describes the column meta data of a MSSQL table.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @author Christophe Boulain <Christophe.Boulain@gmail.com>
 * @package system.db.schema.mssql
 */
class CMssqlColumnSchema extends CDbColumnSchema
{

    /**
     * Initializes the column with its DB type and default value.
     * This sets up the column's PHP type, size, precision, scale as well as default value.
     * @param string $dbType the column's DB type
     * @param mixed $defaultValue the default value
     */
    public function init($dbType, $defaultValue)
    {
        if ($defaultValue == '(NULL)') {
            $defaultValue = null;
        }
        parent::init($dbType, $defaultValue);
    }


    /**
     * Extracts the PHP type from DB type.
     * @param string $dbType DB type
     */
    protected function extractType($dbType)
    {
        if (strpos($dbType, 'float') !== false || strpos($dbType, 'real') !== false)
            $this->type = 'double';
        elseif (strpos($dbType, 'bigint') === false && (strpos($dbType, 'int') !== false || strpos($dbType, 'smallint') !== false || strpos($dbType, 'tinyint')))
            $this->type = 'integer';
        elseif (strpos($dbType, 'bit') !== false)
            $this->type = 'boolean';
        else
            $this->type = 'string';
    }

    /**
     * Extracts the default value for the column.
     * The value is typecasted to correct PHP type.
     * @param mixed $defaultValue the default value obtained from metadata
     */
    protected function extractDefault($defaultValue)
    {
        if ($this->dbType === 'timestamp')
            $this->defaultValue = null;
        else
            parent::extractDefault(str_replace(array('(', ')', "'"), '', $defaultValue));
    }

    /**
     * Extracts size, precision and scale information from column's DB type.
     * We do nothing here, since sizes and precisions have been computed before.
     * @param string $dbType the column's DB type
     */
    protected function extractLimit($dbType)
    {
    }

    /**
     * Converts the input value to the type that this column is of.
     * @param mixed $value input value
     * @return mixed converted value
     */
    public function typecast($value)
    {
        if ($this->type === 'boolean')
            return $value ? 1 : 0;
        else
            return parent::typecast($value);
    }
}
